In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: Fix dereference of null pointer flow
In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then
nft_flow_rule_create is not called and flow is NULL. The subsequent
error handling execution via label err_destroy_flow_rule will lead
to a null pointer dereference on flow when calling nft_flow_rule_destroy.
Since the error path to err_destroy_flow_rule has to cater for null
and non-null flows, only call nft_flow_rule_destroy if flow is non-null
to fix this issue.
Addresses-Coverity: (“Explicity null dereference”)
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"versions": [
{
"version": "09b1f676e2e0",
"lessThan": "70a5a1950cca",
"status": "affected",
"versionType": "git"
},
{
"version": "3c5e44622011",
"lessThan": "4ca041f919f1",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"versions": [
{
"version": "5.13.2",
"lessThan": "5.13.5",
"status": "affected",
"versionType": "custom"
}
]
}
]